Quick answer
The lender orders or reviews a flood-zone determination for the specific property. If the building is in a mapped Special Flood Hazard Area and the loan falls under mandatory purchase rules, acceptable flood coverage is generally required before closing.
Do not rely only on a listing, seller statement or map screenshot. Confirm the lender’s determination and obtain a property-specific quote.
A flood zone is not a prediction
FEMA maps identify areas using defined flood-hazard probabilities and are the official source for National Flood Insurance Program mapping products. They do not show that one particular home will or will not flood.
Properties outside high-risk mapped areas can experience flooding from rainfall, drainage, storm surge, waterways or changing conditions. Optional coverage is a separate risk decision when the lender does not require it.
What affects the mortgage budget
The premium, coverage amount, deductible and policy type affect the housing budget. When coverage is escrowed, the premium can affect the total monthly mortgage payment.
Elevation information, construction, occupancy, replacement cost and the selected insurer may affect the quote. Compare actual terms rather than estimating from a neighboring property.
When the map or determination is disputed
FEMA provides processes for map changes and documentation when a property owner believes the mapped designation is incorrect. That process is separate from the purchase contract and may not fit a short closing timeline.
Ask the lender what documentation it will accept and whether coverage remains required while a map-change request is pending.